Blood in urine of lung squamous cancer may be the result of metastasis of lung squamous cancer tumor to urinary system, side effect of chemotherapy, kidney function damage and so on. If the tumor of lung squamous cancer metastasis invades bladder, kidney and other parts of the body, it is possible that the tumor invades its blood vessels, and the patient will have blood in urine when urinating. If patients have received chemotherapy, the side effects of chemotherapy drugs may trigger hemorrhagic cystitis, and patients will also have the symptom of blood in urine. If the decline of kidney function is triggered by the diagnosis and treatment process of patients with original kidney disease, and the kidney damage is serious, the situation of hematuria in the naked eye can occur. In addition to the blood in urine caused by the above conditions, there can also be other causes of blood in urine such as urinary stones, nephritis, etc., you should go to the hospital in time, diagnosed and treated by a professional doctor.